[Xen-users] Networking Issues in Xen 3.2 + FC8

[Dushmant Mohapatra <d_mpatra@xxxxxxxxx>]

Hi,

I installed Xen 3.2 (compiled from source) and installed it on top of Fedora 8 (x86-64). My laptop is a core2duo (without VT support).


My Dom0 boots properly. But I do not see in 'xenbr0' after I start xend.

The outputs from ifconfig before and after  xend start are as:

<<<<<<<<<<<<<<<<<<<<<
Before Xend :

[root@dmcomp ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1B:24:90:40:AF 
          inet addr:143.215.205.64  Bcast:143.215.207.255  Mask:255.255.252.0
          inet6 addr: fe80::21b:24ff:fe90:40af/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1642 errors:0 dropped:0 overruns:0 frame:0
          TX packets:475 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:401312 (391.9 KiB)  TX bytes:79428 (77.5 KiB)
          Base address:0x4000 Memory:da000000-da020000

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2381 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2381 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2247028 (2.1 MiB)  TX bytes:2247028 (2.1 MiB)
>>>>>>>>>>>>>>>>>

<<<<<<<<<<<<<<<<<
After Xend Start:
[root@dmcomp ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:1B:24:90:40:AF 
          inet addr:143.215.207.63  Bcast:143.215.207.255  Mask:255.255.252.0
          inet6 addr: fe80::21b:24ff:fe90:40af/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:87 errors:0 dropped:0 overruns:0 frame:0
          TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:7105 (6.9 KiB)  TX bytes:10590 (10.3 KiB)

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:2381 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2381 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2247028 (2.1 MiB)  TX bytes:2247028 (2.1 MiB)

peth0     Link encap:Ethernet  HWaddr 00:1B:24:90:40:AF 
          inet6 addr: fe80::21b:24ff:fe90:40af/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1791 errors:0 dropped:0 overruns:0 frame:0
          TX packets:542 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:415302 (405.5 KiB)  TX bytes:90984 (88.8 KiB)
          Base address:0x4000 Memory:da000000-da020000

 >>>>>>>>>>>>>>>>>>>>>

<<<<<<<<<<<<<<<<<<<<<<
My xend-config file :

# -*- sh -*-

#
# Xend configuration file.
#

# This example configuration is appropriate for an installation that
# utilizes a bridged network configuration. Access to xend via http
# is disabled. 

# Commented out entries show the default for that entry, unless otherwise
# specified.

#(logfile /var/log/xen/xend.log)
#(loglevel DEBUG)


# The Xen-API server configuration.  (Please note that this server is
# available as an UNSUPPORTED PREVIEW in Xen 3.0.4, and should not be relied
# upon).
#
# This value configures the ports, interfaces, and access controls for the
# Xen-API server.  Each entry in the list starts with either unix, a port
# number, or an address:port pair.  If this is "unix", then a UDP socket is
# opened, and this entry applies to that.  If it is a port, then Xend will
# listen on all interfaces on that TCP port, and if it is an address:port
# pair, then Xend will listen on the specified port, using the interface with
# the specified address.
#
# The subsequent string configures the user-based access control for the
# listener in question.  This can be one of "none" or "pam", indicating either
# that users should be allowed access unconditionally, or that the local
# Pluggable Authentication Modules configuration should be used.  If this
# string is missing or empty, then "pam" is used.
#
# The final string gives the host-based access control for that listener. If
# this is missing or empty, then all connections are accepted.  Otherwise,
# this should be a space-separated sequence of regular expressions; any host
# with a fully-qualified domain name or an IP address that matches one of
# these regular expressions will be accepted.
#
# Example: listen on TCP port 9363 on all interfaces, accepting connections
# only from machines in example.com or localhost, and allow access through
# the unix domain socket unconditionally:
#
#   (xen-api-server ((9363 pam '^localhost$ example\\.com$')
#                    (unix none)))
#
# Optionally, the TCP Xen-API server can use SSL by specifying the private
# key and certificate location:
#
#                    (9367 pam '' /etc/xen/xen-api.key /etc/xen/xen-api.crt)
#
# Default:
#   (xen-api-server ((unix)))


#(xend-http-server no)
#(xend-unix-server no)
#(xend-tcp-xmlrpc-server no)
#(xend-unix-xmlrpc-server yes)
#(xend-relocation-server no)
(xend-relocation-server yes)

#(xend-unix-path /var/lib/xend/xend-socket)


# Address and port xend should use for the legacy TCP XMLRPC interface,
# if xen-tcp-xmlrpc-server is set.
#(xen-tcp-xmlrpc-server-address 'localhost')
#(xen-tcp-xmlrpc-server-port 8006)

# SSL key and certificate to use for the legacy TCP XMLRPC interface.
# Setting these will mean that this port serves only SSL connections as
# opposed to plaintext ones.
#(xend-tcp-xmlrpc-server-ssl-key-file  /etc/xen/xmlrpc.key)
#(xend-tcp-xmlrpc-server-ssl-cert-file /etc/xen/xmlrpc.crt)


# Port xend should use for the HTTP interface, if xend-http-server is set.
#(xend-port            8000)

# Port xend should use for the relocation interface, if xend-relocation-server
# is set.
#(xend-relocation-port 8002)

# Address xend should listen on for HTTP connections, if xend-http-server is
# set.
# Specifying 'localhost' prevents remote connections.
# Specifying the empty string '' (the default) allows all connections.
#(xend-address '')
#(xend-address localhost)

# Address xend should listen on for relocation-socket connections, if
# xend-relocation-server is set.
# Meaning and default as for xend-address above.
#(xend-relocation-address '')

# The hosts allowed to talk to the relocation port.  If this is empty (the
# default), then all connections are allowed (assuming that the connection
# arrives on a port and interface on which we are listening; see
# xend-relocation-port and xend-relocation-address above).  Otherwise, this
# should be a space-separated sequence of regular expressions.  Any host with
# a fully-qualified domain name or an IP address that matches one of these
# regular expressions will be accepted.
#
# For example:
#  (xend-relocation-hosts-allow '^localhost$ ^.*\\.example\\.org$')
#
#(xend-relocation-hosts-allow '')
(xend-relocation-hosts-allow '^localhost$ ^localhost\\.localdomain$')

# The limit (in kilobytes) on the size of the console buffer
#(console-limit 1024)

##
# To bridge network traffic, like this:
#
# dom0: ----------------- bridge -> real eth0 -> the network
#                            |
# domU: fake eth0 -> vifN.0 -+
#
# use
#
# (network-script network-bridge)
#
# Your default ethernet device is used as the outgoing interface, by default.
# To use a different one (e.g. eth1) use
#
# (network-script 'network-bridge netdev=eth1')
#
# The bridge is named xenbr0, by default.  To rename the bridge, use
#
# (network-script 'network-bridge bridge=<name>')
#
# It is possible to use the network-bridge script in more complicated
# scenarios, such as having two outgoing interfaces, with two bridges, and
# two fake interfaces per guest domain.  To do things like this, write
# yourself a wrapper script, and call network-bridge from it, as appropriate.
#
(network-script network-bridge)

# The script used to control virtual interfaces.  This can be overridden on a
# per-vif basis when creating a domain or a configuring a new vif.  The
# vif-bridge script is designed for use with the network-bridge script, or
# similar configurations.
#
# If you have overridden the bridge name using
# (network-script 'network-bridge bridge=<name>') then you may wish to do the
# same here.  The bridge name can also be set when creating a domain or
# configuring a new vif, but a value specified here would act as a default.
#
# If you are using only one bridge, the vif-bridge script will discover that,
# so there is no need to specify it explicitly.
#
(vif-script vif-bridge)


## Use the following if network traffic is routed, as an alternative to the
# settings for bridged networking given above.
#(network-script network-route)
#(vif-script     vif-route)


## Use the following if network traffic is routed with NAT, as an alternative
# to the settings for bridged networking given above.
#(network-script network-nat)
#(vif-script     vif-nat)


# Dom0 will balloon out when needed to free memory for domU.
# dom0-min-mem is the lowest memory level (in MB) dom0 will get down to.
# If dom0-min-mem=0, dom0 will never balloon out.
(dom0-min-mem 196)

# In SMP system, dom0 will use dom0-cpus # of CPUS
# If dom0-cpus = 0, dom0 will take all cpus available
(dom0-cpus 0)

# Whether to enable core-dumps when domains crash.
#(enable-dump no)

# The tool used for initiating virtual TPM migration
#(external-migration-tool '')

# The interface for VNC servers to listen on. Defaults
# to 127.0.0.1  To restore old 'listen everywhere' behaviour
# set this to 0.0.0.0
#(vnc-listen '127.0.0.1')

# The default password for VNC console on HVM domain.
# Empty string is no authentication.
(vncpasswd '')

# The VNC server can be told to negotiate a TLS session
# to encryption all traffic, and provide x509 cert to
# clients enalbing them to verify server identity. The
# GTK-VNC widget, virt-viewer, virt-manager and VeNCrypt
# all support the VNC extension for TLS used in QEMU. The
# TightVNC/RealVNC/UltraVNC clients do not.
#
# To enable this create x509 certificates / keys in the
# directory /etc/xen/vnc
#
#  ca-cert.pem       - The CA certificate
#  server-cert.pem   - The Server certificate signed by the CA
#  server-key.pem    - The server private key
#
# and then uncomment this next line
# (vnc-tls 1)

# The certificate dir can be pointed elsewhere..
#
# (vnc-x509-cert-dir /etc/xen/vnc)

# The server can be told to request & validate an x509
# certificate from the client. Only clients with a cert
# signed by the trusted CA will be able to connect. This
# is more secure the password auth alone. Passwd auth can
# used at the same time if desired. To enable client cert
# checking uncomment this:
#
# (vnc-x509-verify 1)

# The default keymap to use for the VM's virtual keyboard
# when not specififed in VM's configuration
#(keymap 'en-us')

# Script to run when the label of a resource has changed.
#(resource-label-change-script '')
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>


But in both the cases I am able to access network.


But I face further problems when I  try to start a  domain U. I use the same kernel  built for Dom 0 to boot Dom U . The config file I use for this is :
<<<<<<<<<<<<<<<<
kernel = "/boot/vmlinuz-2.6.18.8-xen"
memory = 256
name = "fedora.fc8.64"
vif = [ '' ]
dhcp= "dhcp"
#disk = ['file:/xen/fedora/fedora.fc8.64.img,sda1,w', 'file:/xen/fedora/fedora.swap,sda2,w']
disk = ['file:/home/dmpatra/Xen_Downloads/xen-domU/fedora.fc8.64.img,sda1,w', 'file:/home/dmpatra/Xen_Downloads/xen-domU/fedora.swap,sda2,w']
root = "/dev/sda1"
extra = "fastboot"
>>>>>>>>>>>>>>>>

fedora.fc8.64.img refers to a fedora 8 64 bit image obtained from jailtime.org and fedora.swap is the corresponding swap file.

After this the booting of the domU starts. But I loose my network acess. And the domU booting goes till dhcp configuration and loops.

So if any one else has faced a similar problem and has found a solution then please let me know. If I am doing some thing wrong then let me know.

Thanks in advance,
Dushmanta

---

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